docs: def get_aggregation_propensity(self, email, password, cutoff_v=5, cutoff_n=5, run_amylmuts=False, outdir=None):
          """Run the AMYLPRED2 web server to calculate the aggregation propensity of this protein sequence, which is
          the number of aggregation-prone segments on the unfolded protein sequence.
  
          Stores statistics in the ``annotations`` attribute, under the key `aggprop-amylpred`.
  
          See :mod:`ssbio.protein.sequence.properties.aggregation_propensity` for instructions and details.
  
          """
          if not outdir:
              outdir = self.sequence_dir
              if not outdir:
                  raise ValueError('Output directory must be specified')
  
          import ssbio.protein.sequence.properties.aggregation_propensity as agg
  
          agg_predictions = agg.AMYLPRED(email=email, password=password)
          result = agg_predictions.get_aggregation_propensity(seq=self, outdir=outdir,
                                                              cutoff_v=cutoff_v, cutoff_n=cutoff_n,
                                                              run_amylmuts=run_amylmuts)
          self.annotations['aggprop-amylpred'] = result